Silica Fume (Microsilica) - Grade 85 / 90 / 92
Bulk and bagged microsilica supplied directly from verified Chinese production sources. ASTM C1240 / GB/T 18736 compliant. FOB / CIF terms available from major Chinese ports.
Miningsun supplies silica fume to ready-mix plants, precast manufacturers, refractory producers, and infrastructure contractors across the Middle East, Southeast Asia, Africa, and the Americas. Every shipment is third-party tested — COA and MTC included as standard.
Typical use: 5–15% addition by weight of cement to dramatically reduce permeability, increase compressive strength, and improve sulfate and chloride resistance.
GB/T 18736
EN 13263
Grade 90 (≥90% SiO₂)
Grade 92 (≥92% SiO₂)
500 MT (bulk vessel)
after PO confirmation
Higher Strength & Lower Permeability
5–15% silica fume addition significantly increases compressive strength and dramatically reduces water permeability — critical for long-service-life structures.
Sulfate & Chloride Resistance
Essential for marine, coastal, and chemically aggressive environments. Specification-grade purity verified by third-party testing on every shipment.
Verified Source, Stable Supply
Long-term contracts with established Chinese production facilities. Consistent quality and reliable shipment schedules — not spot-market sourcing.
Densified & Undensified Available
Both forms stocked. Densified for easier handling and bulk transport; undensified for applications requiring maximum reactivity.
Flexible Packaging & Incoterms
25 kg bags, 1 MT jumbo bags, or bulk vessel loading. FOB, CIF, and CFR available from Tianjin, Qingdao, Shanghai, and Lianyungang.
Full Export Documentation
COA, MTC, CO, MSDS, and third-party inspection (SGS / BV / CIQ) available. All paperwork handled by our experienced export team.
Specifications by Grade
Three SiO₂ activity grades aligned with ASTM C1240 and GB/T 18736. Grade 90 is the most widely specified grade for ready-mix, precast, and marine concrete applications worldwide.
| Parameter | Test Standard | Grade 85 | Grade 90 | Grade 92 |
|---|---|---|---|---|
| SiO₂ Content (min) | ASTM C1240 / GB/T 18736 | ≥ 85% | ≥ 90% | ≥ 92% |
| Specific Surface Area | BET | 15,000 – 25,000 m²/kg | ||
| Average Particle Size | Laser Diffraction | 0.1 – 0.2 μm | ||
| Bulk Density (Densified) | ISO 6274 | 500 – 700 kg/m³ | ||
| Pozzolanic Activity Index (min) | ASTM C1240 | ≥ 95% | ≥ 100% | ≥ 105% |
| Moisture Content (max) | EN 196-2 | ≤ 3% | ||
| Loss on Ignition (max) | EN 196-2 | ≤ 10% | ≤ 8% | ≤ 6% |
| Chloride Content (max) | EN 196-2 | ≤ 0.02% | ||
* Typical values from production. Batch-specific COA issued with every shipment.
Where Our Customers Use Silica Fume
From offshore platforms in the Gulf to tunneling projects in Southeast Asia — microsilica is specified wherever strength, impermeability, and long service life are non-negotiable.
High-Performance Concrete
High-rise structures, long-span bridges, and infrastructure requiring C60+ mix designs.
Marine & Offshore Structures
Platforms, jetties, sea walls exposed to chloride-rich environments.
Tunneling & Shotcrete
Rapid strength gain and adhesion for tunnel linings and underground works.
Precast & Prestressed Concrete
Improved surface finish, reduced efflorescence, consistent quality at scale.
Refractory & Industrial Castables
High-temperature applications requiring bonding and thermal stability.
Oil Well Cementing
Enhanced slurry density and impermeability for demanding downhole conditions.
Packaging, Ports & Payment
Flexible packaging and incoterms to match your project size and discharge facilities.
Packaging Options
- 25 kg PP / paper bags, palletized & shrink-wrapped
- 1,000 kg / 1,500 kg jumbo bags (FIBC) with PE liner
- Bulk loading into vessel holds (500+ MT)
- 20' / 40' container loading available
- Custom private-label bagging on request
Loading Ports
- Tianjin / Xingang Port (primary)
- Qingdao Port
- Shanghai Port
- Lianyungang Port
- Bulk vessels and container shipments arranged
Payment Terms
- 30% T/T deposit, 70% balance against B/L copy
- L/C at sight (irrevocable, from prime banks)
- D/P, D/A negotiable for established buyers
- Trial orders accepted to build long-term relationships
Documentation Provided
- Commercial Invoice & Packing List
- Bill of Lading (B/L)
- Certificate of Origin (CO / Form A / FORM E)
- Mill Test Certificate (MTC) & COA per shipment
- SGS / BV / CIQ inspection on request
20+ Years of Export Experience
China is the world's dominant producer of silicon metal and ferrosilicon. Miningsun has direct access to consistent, high-purity microsilica from established production facilities — and the export logistics expertise to deliver it reliably, anywhere.
- Verified production sourcing — long-term contracts with major Chinese silicon furnace operations
- Third-party tested — ASTM C1240 / GB/T 18736 with COA on every shipment
- Stable pricing — quarterly fixed-price contracts available for repeat buyers
- Reliable lead times — 15–25 days from PO to vessel loading
- Multi-port loading — Tianjin, Qingdao, Shanghai, Lianyungang
- Export documentation — full set including CO, MTC, MSDS, fumigation as required
- Responsive sales team — quotes within 24 hours, English / Chinese / Spanish
Technical & Compliance Documents
Available to qualified buyers upon request — please specify Grade and quantity when reaching out.